描述
(1)互感器誤差的補(bǔ)償:
①匝數(shù)補(bǔ)償:我們從及I1W1=I2W2=兩式可知、互感器的電流與匝數(shù)成反比。如若二次繞組比額定匝數(shù)W少繞WX匝,WX要補(bǔ)的匝數(shù),當(dāng)匝數(shù)補(bǔ)償后二次側(cè)電流將成反比例增大而達(dá)到補(bǔ)償誤差的目的。
②磁分路補(bǔ)償:在雙鐵芯補(bǔ)償中,只補(bǔ)償匝數(shù),雖然在10%Ib時(shí)對(duì)TA的誤差能進(jìn)行理想補(bǔ)償。但為補(bǔ)償數(shù)值的恒定,考慮磁分路的補(bǔ)償、也相應(yīng)減少輔助鐵芯的戴面積。
③磁分路短路匝補(bǔ)償:互感器的角差,是在10%Ib以下時(shí)變化較大,當(dāng)采用磁分路補(bǔ)償時(shí),在對(duì)互感器的比差進(jìn)行補(bǔ)償?shù)囊矊?duì)角差起到補(bǔ)償作用。
(2)互感器誤差的補(bǔ)償:
①減少繞組的阻抗和電抗,互感器的一、二次線圈導(dǎo)線截面積應(yīng)按0.4~0.8A/mm2來選擇。因電阻、阻抗與線圈每匝的長(zhǎng)度成反比,為盡量縮小每匝長(zhǎng)度、應(yīng)采用園型鐵芯為好。
②減少互感器的誤差,鐵芯內(nèi)的磁通密度應(yīng)取小。選擇優(yōu)質(zhì)的鐵芯材料,鐵芯的連接緊湊,這可減少互感器的誤差和空載電流及鐵芯的損耗。
③為提高互感器的比差準(zhǔn)確度,我們可適當(dāng)調(diào)節(jié)一次繞組的線圈匝數(shù)。要想改進(jìn)角差的準(zhǔn)確度,我們可一次繞組的線徑。當(dāng)互感器的比差為負(fù)超差時(shí),可適當(dāng)減少一次繞組的匝數(shù),使二次負(fù)載等于給定準(zhǔn)確等級(jí)下額定容量一半時(shí),差比值接近為零。當(dāng)角差為正超差時(shí),可適當(dāng)減少一次繞組的線徑(例如0.23mm2改用0.21mm2線徑)。
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